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optical relief
Optical relief (usually noted as simply relief) is a concept in optical mineralogy which refers to the degree in which mineral grains stand out from the mounting medium,〔Nesse, W. D., 1991, Introduction of Optical Mineralogy, 2nd edition, p. 25.〕 usually either oil with a known refractive index or Canada Balsam. Relief is an important part of the Becke line test.
==Magnitude==
Minerals that stand out significantly (have a difference in refractive index of .12 or more) have high or strong relief, and will have very sharp boundaries between itself and the material it is next to. Intermediate is .04 to .12, and low or weak is less than .04. Low relief materials have boundaries that are hard to distinguish from each other.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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